Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Coacting shaping surfaces
Reexamination Certificate
1999-05-15
2001-05-29
Pyon, Harold (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Coacting shaping surfaces
C425S420000
Reexamination Certificate
active
06238199
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to a device for producing formed or molded parts from a not freely-flowing mixture of heat and/or fiber materials and heat-hardenable binders.
More particularly, it relates to a device of the above mentioned type which has a pressing tool lower part, and a pressing tool upper part which is vertically guided on the pressing tool lower part, with the pressing tool upper part being frame-shaped, surrounding a filling chamber, and being closable by a cover, with supply passages provided in the walls directed toward the filling chamber.
Such devices are known in the art. One of such devices is disclosed for example in the European patent document EP-A-0 443 053. In the production of the formed parts in this arrangement from the above mentioned mixture, hot gasses or vapors introduced in the pressing tool are evaporated from a mixture before pressing. The mixture before the pressing of the formed parts must be simultaneously relieved from the hot gasses or vapors. During the production of the formed parts conventionally due to the different forms, different pressing tool lower parts and pressing tool upper parts are required, to form a corresponding filling chamber in filling condition. It is however advantageous when the same press can be used for pressing of different formed parts, with the design which is identical and having for example only different thicknesses.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a multi-purpose press which is improved so that the same tool can be used for producing of formed parts having different heights.
In keeping with these objects and with others which will become apparent hereinafter, one feature of present invention resides, briefly stated in an arrangement for producing formed parts of the above mentioned general type, in which on the outer side of the pressing tool lower part a blocking device for guiding passages connected with it is arranged.
When the press is designed in accordance with the present invention, the filling chamber which receives the mixture corresponds to the thickness of a formed part to be pressed, and when not needed the supply passages of hot gasses or vapors are closed.
In accordance with another feature of the present invention, the blocking device is formed as at least one plate which abuts against a part of the inner surface of the pressing tool upper part.
In accordance with still a further feature of the present invention the plate is supported against the pressing tool lower part by a spring.
Finally in accordance with still another feature of present invention, the blocking device is composed of a sealing plunger arranged in a collecting conduit for the guiding passages.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
patent: 5078938 (1992-01-01), Monk et al.
patent: 0 443 053 A1 (1991-08-01), None
Huber Helmuth
Schallenmueller Karl-Heinz
Weinberg Gerd
Del Sole Joseph S.
Pyon Harold
Striker Michael J.
Werzalit AG + Co.
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